delirium

< /dɪˈlɪər i ə/.

1. Pathology. a more or less temporary disorder of the mental faculties, as in fevers, disturbances of consciousness, or intoxication, characterized by restlessness, excitement, delusions, hallucinations, etc.
2. a state of violent excitement or emotion.

noun plural -liriums or -liria (-ˈlɪrɪə)

1. a state of excitement and mental confusion, often accompanied by hallucinations, caused by high fever, poisoning, brain injury, etc
2. violent excitement or emotion; frenzy

n.

1590s, from Latin delirium “madness,” from deliriare “be crazy, rave,” literally “go off the furrow,” a plowing metaphor, from phrase de lire, from de “off, away” (see de-) + lira “furrow, earth thrown up between two furrows,” from PIE *leis- “track, furrow.”

n. pl. de•lir•i•ums

1. A temporary state of mental confusion resulting from high fever, intoxication, shock, or other causes, and characterized by anxiety, disorientation, memory impairment, hallucinations, trembling, and incoherent speech.